Personal care products containing high refractive index esters and methods of preparing the same

ABSTRACT

The invention includes personal care compositions and methods of preparing these personal care compositions that include incorporation of a polyol polyester that is the reaction product of an aliphatic polyol that does not contain an ether group, and benzoic acid, wherein the resultant polyol polyester has a refractive index at 25° C. of greater than about 1.5. The aliphatic polyol may have two to three carbon atoms. Alternatively, the invention includes personal care compositions and methods of preparing personal care compositions including incorporating a polyol polyester into a personal care formulation. The polyol polyester is represented by formula (I):  
                 
wherein R is an aliphatic alkyl group that does not contain an ether group and has a refractive index of greater than about 1.5 at 25° C. Also described are methods of preparing personal care compositions comprising a first phase and a second phase, wherein the second phase contains any of the polyol polyesters described above.

BACKGROUND OF THE INVENTION

Conventional personal care products including cosmetic compositions thatare topically applied to the skin and hair often contain ester oils.Incorporation of ester oils into these products provides benefits suchas improvement of the softness and smoothness of the skin andconditioning effects to the hair (for example, by reducing the forcerequired to comb wet or dry hair). When incorporated into personal careproducts, ester oils tend to contribute substantiveness, e.g, theyadhere to the substrate (hair shaft or stratum corneum) due to theirpolarity and they additionally provide the aforementioned benefitswithout contributing negative aesthetics such as oiliness andgreasiness.

Shine, gloss, and clarity are attributes that are often highly desiredin personal care products, especially those that are applied to theskin, hair and nails. For example, shine and gloss are especiallyimportant in products such as lipsticks, lip glosses (clear orpigmented), and other cosmetics used to impart color to the skin(“decorative cosmetics”). Clarity is a particularly desirablecharacteristic in an antiperspirant composition. For hair care products,shine and gloss are highly desired, mostly in applications such as hairtonics, mousses, setting lotions, dressings, and conditioningcompositions.

Personal care products, such as the cosmetic compositions describedabove, are typically applied as a composition that has the form of anemulsion, a solution, a suspension, a gel, and/or a solid. Afterapplication, a layer consisting of a mixture of the non-volatile,non-penetrating ingredients is left on the surface of the substrate. Itis this layer that provides the desired color, aesthetic,beautification, and/or therapeutic benefit.

The attributes of shine and gloss are directly related to the smoothnessof the surface layer after application and to the aggregate reflectivityof the components that comprise the layer. The Fresnel law ofdiffraction states that the intensity of a reflected beam of lightemanating from air that is incident on a surface of a material is afunction of: (1) the angle of incidence, (2) the polarization of theincident beam, and (3) the index of refraction of the material.Reflectivity (“R”) is defined as the ratio of the intensity of thereflected beam (“I_(r)”) to the intensity of the incident beam(“I_(i)”). By application of the Fresnel law, the equation relating R tothe refractive index of the surface material (“n”) is given by:R═I _(i) /I _(i)=(n−1)²/(n+1)²Thus, the higher the refractive index of the layer of personal careproduct, the greater its reflectivity.

In the case of a personal care product, the material that comprises thesurface layer is a mixture of non-volatile, non-penetrating ingredientsthat may not be miscible in one another. Various equations have beendeveloped using a combination of the electromagnetic theory of light andempirical methods to predict the refractive index of mixtures. The mostwidely used mixing rule for the prediction of the refractive index ofbinary systems is that of Lorentz-Lorenz. The Lorentz-Lorenz equationstates that the square of the mixture refractive index minus one dividedby the square of the mixture refractive index plus two is equivalent tothe sum of the volume fraction of the individual components, times theirrespective refractive index squared minus one divided by their squareplus two respectively. This relation can be extended to include ternary,quaternary, and higher order mixtures.

In formulating a personal care product one may estimate the compositionsof the immiscible phases in the surface layer to calculate theirrespective refractive indices. With this information, one may implementa formulation strategy to achieve clarity in the final formulation bymatching the refractive indices of all phases within the surface layer.The lesser the difference between/among each of the refractive indices,the greater the clarity, shine and/or gloss of the final product.

In personal care products where clarity, shine and or/gloss may bedesirable, the relatively low refractive indices of most ester oilsmakes it difficult to achieve these properties, as the formulations alsocontain primarily compounds of lower refractive indices, such as castoroil, high viscosity silicones (e.g., 100 centipoise to 1000 centipoise),film formers, and/or high viscosity esters. Yet, elimination of thesecompounds is undesirable as well, because of the advantageous propertiesthey contribute to the formulation.

Thus, there is a need for liquid, light viscosity, non-irritating,non-penetrating esters for use in personal care compositions with highrefractive indices, such that improved shine, gloss and clarity can beobtained. Moreover, personal care compositions with these estersincorporated into their formulations are also desirable.

SUMMARY OF THE INVENTION

The invention provides personal care compositions containing, liquid,light viscosity, non-irritating, non-penetrating polyol polyestersesters having high refractive indices, preferably greater than about 1.5at 25° C. These personal care compositions, depending on theirunderlying formulation, exhibit improved shine, gloss, and/or clarity incomparison to prior art formulations.

The invention provides a method of preparing a personal care compositionthat includes reacting an aliphatic polyol having two to three carbonatoms, but which does not contain an ether group, and benzoic acid. Theresultant polyol polyester has a refractive index at 25° C. of greaterthan about 1.5. The polyol polyester is incorporated into a personalcare formulation and/or can be used to adjust the refractive index of aphase of a personal care composition having at least two phases.

The invention also includes methods of preparing personal carecompositions that include incorporation of a polyol polyester into apersonal care formulation. The polyol polyester is represented by theformula (I):

wherein R is an aliphatic alkyl group that does not contain an ethergroup. The polyol polyester has a refractive index of greater than about1.5 at 25° C.

Also included is a personal care composition that contains a polyolpolyester represented by formula (I):

wherein R is an aliphatic alkyl group that does not contain an ethergroup. This polyol polyester may have a refractive index of greater than1.5 at 25° C.

Methods of preparing two phase personal care compositions are alsodisclosed. The methods include mixing a first phase with a second phase,wherein the second phase includes a polyol polyester represented by theformula (I), above, and R is an aliphatic alkyl group that does notcontain an ether group. In such methods, the refractive index of thefirst phase is substantially identical to the refractive index of thesecond phase.

Methods of preparing personal care compositions having refractiveindices of greater than about 1.4 at 25° C. are also included. Thesemethods include mixing at least one aliphatic ester with a polyolpolyester that is represented by the formula (I) wherein R is analiphatic alkyl group that does not contain an ether group and thecomposition has a refractive index of greater than about 1.4.

DETAILED DESCRIPTION OF THE INVENTION

The invention described herein relates to personal care productscontaining specific polyol polyesters to enhance the shine, gloss, andclarity exhibited by such compositions when applied to skin, hair, ornail surfaces. The invention provides non-penetrating, non-volatile,light viscosity, high refractive index ester oils in personal carecompositions thereby providing benefits in skin, hair, and nail careapplications such as improvements of shine, gloss, clarity, and otheraesthetic and/or comfort-related properties of the composition. Thespecific polyol polyesters are incorporated into personal careformulations to prepare the personal care compositions of the invention.

By “personal care composition” it is meant any composition that is usedor marketed as a material to be applied to skin, hair or nails and/orthe stratum corneum of human or animal subjects for cosmetic, aestheticand/or therapeutic effects, regardless of the delivery form of thecomposition and may include phases or intermediate preparationsultimately formulated into personal care products. Such compositions caninclude grooming products, such as soaps, cleansers, shampoos, skin orhair conditioners, shaving cream, lotions, and gels; hair sprays, gels,tonics, mousses, pomades, and lacquers; antiperspirants and deodorants;skin lotion, cream, mousse, and ointments, and nail and cuticle careproducts such as polishes and creams, and color-imparting cosmetics suchas lipsticks, mascaras, foundations, eye shadows, and other decorativecosmetics.

The polyol polyester that is incorporated into the personal care productof the invention has a refractive index measured at 25° C. of greaterthan about 1.5 at 25° C., with a refractive index of about 1.5 to about1.7 at 25° C. being preferred. Methods for empirically determining therefractive index of a given compound are well known in the art; any ofthese methods may be used. Preferred is the method using an Abberefractomer, as described in, e.g., ASTM 1045-95 (2001), the contents ofwhich are incorporated herein by reference.

The polyol polyester that is incorporated into the personal care productmay be the reaction product of (a) an aliphatic polyol having two tothree carbon atoms but that does not contain an ether group and (b)benzoic acid. Suitable aliphatic polyol(s) include all those known or tobe developed in the art, so long as the alkyl group contains at leastone, at least two, or at least three carbon atoms. A preferred aliphaticpolyol has two to three carbon atoms. In addition, it is desirable thatthe selected aliphatic alkyl group does not contain an ether group alongthe backbone; the selected aliphatic alkyl group may be substituted orunsubstituted.

Exemplary aliphatic polyol(s) that may be reacted with benzoic acidinclude 1,2-ethanediol, 1,2-propanediol, or 1,3-propanediol. Theresultant polyol polyester may be substituted at any location along thebackbone with any functional, organic, or other group known in the art.

An exemplary polyol polyester is represented by the formula (I):

wherein R represents a substituted or unsubstituted aliphatic alkylgroup. Any aliphatic alkyl group is suitable. However, aliphatic alkylgroups having at least one, at least two, or at least three carbon atomsin the backbone are preferred. Most preferred are those having two tothree carbon atoms in the backbone. Additionally, it is preferred thatthe selected alkyl group does not contain an ether group within itsbackbone. The polyol polyester represented by formula (I) may besubstituted at any location along the backbone with any functional,organic or other group known in the art.

The polyol polyester that is present in the personal care product of theinvention preferably has a low, or light viscosity, as such lowviscosity may make it more suitable for use in some personal careformulations. For example, the viscosity of the polyol polyester of theinvention will range from about 30 cSt to about 200 cSt, more preferably40 cSt to 100 cSt, and most preferably, 50 cSt to 80 cSt, each measuredat 25° C. As will be understood by a person of skill in the art, thedesired viscosity will depend on the personal care formulation intowhich the particular polyol polyester is to be incorporated.

Preferred polyol polyesters for use in the methods of the inventioninclude ethylene glycol dibenzoate, propylene glycol dibenzoate, and1,3-propanediol dibenzoate.

The invention also includes a method of preparing a personal carecomposition by incorporating the polyol polyester as described aboveinto a personal care formulation. Any personal care formulation known orto be developed in the prior art is suitable for use in the method. Thepersonal care formulation may be a formulation for any type of personalcare product.

Exemplary formulations include those for soaps (liquid, solid, foam ormousse), cleansers, creams, lotions, ointments, suspensions, shampoos,deodorants, antiperspirants, conditioning products for hair, skin andnails and decorative cosmetics. The personal care formulations selectedmay include organic components, inorganic components; color activeingredients (e.g., pigments and dyes); therapeutic active ingredients(e.g., vitamins, alpha hydroxyacids, corticosteroids, amino acids,collagen, retinoids, anti-microbial compounds), sunscreens and/or UVabsorbing compounds, reflective compounds, oils such as castor oil,olive oil; film formers, high viscosity oils, high molecular weightesters, high viscosity silicones, antiperspirant active ingredients,glycol solutions, water, alcohols, emulsifiers, gellants, volatilesilicones, non-volatile silicones, emollients, water, polymers,hydrocarbons, and/or aliphatic esters.

Exemplary high molecular weight esters include pentaerythritoltetraisostearate (such as CRODAMOL® PTIS, Croda Corporation, Parsippany,N.J., U.S.A.) and dipentaerythritol hexa C₅-C₉ acid esters (such asLEXFEEL® 350, Inolex Chemical Company, Philadelphia, Pa., U.S.A.). Insome cases such as in a formulation for a personal care product that isa decorative cosmetic, it may be desirable to disperse the color activeingredients (e.g., opaque or translucent pigments or dyes) in such highmolecular weight esters and/or high viscosity oil, such as castor oil.

Exemplary high viscosity silicones that can be include in the personalcare formulation include a two hundred (200) centistokepolydimethylsiloxane polymer (for example, 200 cSt Dow Corning 200Fluid, Dow Corning Corporation, Midland, Mich., U.S.A.). Inclusion ofthese compounds may be suitable if one wishes to modify the smoothnessand slip properties of the personal care product.

Typical film formers that can be used in the personal care formulationcomponent of the invention include acrylate copolymers (such as AVALURE®AC 120, Noveon Corporation, Cleveland, Ohio, U.S.A.), tricontanyl PVP(such as GANEX® WP-660, ISP Corporation, Wayne, N.J., U.S.A.),alpha-olefin/isopropyl maleate copolymer (such as PROFORMA® V1608, NewPhase Technologies, Sugar Land, Tex., U.S.A.). In general, film formerswill be included in the formulation when preparing a product intended tosmooth out surface irregularities in the stratum corneum and to providea stable, immovable matrix for any color active ingredients to beincluded.

The personal care formulation may be an antiperspirant includinginorganic salts and/or inorganic salt/glycine complexes. Examples ofantiperspirant active ingredients include, but are not limited to,activated aluminum chlorohydrate (“AACH”), aluminum zirconiumpolychlorhydrex-glycine complex (“ZAG”) or activated ZAG (“AZAG”). Theantiperspirant active ingredient may be provided to the formulation inany form, including a powder, an aqueous solution, or a glycol solution(e.g., propylene glycol, 1,3-butylene glycol, and dipropylene glycol).

These active ingredients and the solutions in which they are deliveredhave refractive indices typically exceeding 1.43. For example, a thirtypercent (30%), non-aqueous solution of aluminum zirconiumpentachlorohydrex-glycine complex in propylene glycol (such as, forexample, WESTCHLOR® A2Z 8106 30% P.G. Solution, Westwood ChemicalCorporation, Middletown, N.Y., U.S.A.) has a refractive index of 1.460at 25° C. Propylene glycol, a commodity chemical, is commonly used as anon-volatile carrier for the active ingredient phase to lower therefractive index of that phase.

Conventional antiperspirant gels are microemulsions made up of twoimmiscible phases in which the particle size of the internal phase istypically less than one hundred (100) nanometers. In conventionalpractice, the formulation of clear antiperspirant gels will usuallyinclude the combination of an active ingredient phase and a vehiclephase. The active ingredient phase will normally include one or more ofthe aforementioned antiperspirant active ingredients, either dissolvedor pre-dissolved in water, propylene glycol, other glycols, or mixturesthereof. The vehicle phase will typically include an emulsifier/gellantand a mixture of oily ingredients that are meant to ease the spreadingof the antiperspirant product onto the skin, and to reduce the feelingof drag, greasiness and/or tackiness and/or to reduce the whiteningeffect often observed after antiperspirant products are applied and dryout. The most common emulsifier/gellants used in the formulation ofclear antiperspirant gels are dimethicone crosspolymer and PEG-12dimethicone crosspolymer, ordinarily supplied as a blend incyclopentasiloxane (DOW CORNING® 9040 Silicone Elastomer Blend; DOWCORNING® 9011 Silicone Elastomer Blend, each available from Dow CorningCorporation, Midland, Mich., U.S.A.). Common oily ingredients that areused in the vehicle phase are volatile silicones, non-volatilesilicones, hydrocarbons, and aliphatic esters. In order to obtain aclear or substantially transparent gel, it is important that therefractive index of the active ingredients phase and the vehicle phasematch as closely as possible. Exemplary ingredients that may be includedin the vehicle phase include dimethicones (DOW CORNING® 200 seriesFluids, Dow Corning Corporation, Midland, Mich., U.S.A.) andcyclomethicones (DOW CORNING® 244, 245, 344, 345 Fluids, Dow CorningCorporation, Midland, Mich., USA).

The invention also includes a method of increasing the refractive indexof a composition that includes incorporating into the composition anamount of the polyol polyester that is the reaction product of analiphatic polyol and benzoic acid. The aliphatic polyol may be the samedescribed above.

Also included in the invention is a method of preparing a compositionthat comprises mixing a first phase with a second phase, wherein thesecond phase includes a polyol polyester represented by the formula I:

and R is an aliphatic alkyl group, as described above.

Further, the invention includes a method of preparing a compositionhaving a refractive index of at least about 1.4 at 25° Celsius. Thismethod includes mixing at least one aliphatic ester with a polyolpolyester represented by formula (I), above, wherein the R is analiphatic alkyl group that does not contain an ether group, and thecomposition has a refractive index of at least 1.4 at 25°.

Also included are methods of adjusting the refractive index of a phaseof a personal care composition that comprises at least two phases and/ormethods of preparing a personal care composition of at least two phases,wherein the refractive indices of the at least two phases aresubstantially identical. These methods include:

-   -   (i) preparing a first phase that has a refractive index of less        than or equal to about 1.5,    -   (ii) preparing a second phase that has a refractive index that        is lower than the refractive index of the first phase,    -   (iii) adding to the second phase an amount of a polyol polyester        sufficient to reduce the difference between the refractive index        of the first phase and that of the second phase, and    -   (iv) mixing the first phase with the second phase to prepare a        personal care composition.        The polyol polyester is any one of those described above. It is        preferred that the difference between the refractive indices of        each of the phases after step (iii) is about 0.1 to about 0.5,        more preferred that it is about 0.2 to about 0.5, and most        preferred that it is less than about 0.5. Preferably, the        difference is about zero.

In any of the methods of preparing a personal care composition disclosedherein, one may optionally mix the polyol polyester with an aliphaticester to alter the “skin feel” of the polyol polyester. Any aliphaticester is suitable, although preferred are isopropyl laurate, isopropylmyristate, isopropyl palmitate, ethylhexyl palmitate, neopentyl glycoldiheptanoate, and/or trimethylolpropane tricaprylate/tricaprate.

The following examples provide illustrations of the methods andcomposition of the invention, but are in no way intended to be limiting.In each of the examples, color was evaluated using American Society ofTesting Materials (ASTM) method D-1209 (1997). Acid value was measuredusing ASTM method D-974-95 (1995). Kinematic viscosity was measuredusing ASTM method D-445-97 (1997). Refractive index was measured usingan Abbe digital refractometer. Odor was detected using subjectiveolfactory assessments.

The names for the components given in the personal care compositionexample are those used by the Cosmetic, Toiletry, and FragranceAssociates (CTFA), as set forth in the CTFA International CosmeticIngredient Dictionary and Handbook, 9^(th) ed. (2002).

EXAMPLE 1

Propylene glycol and benzoic acid were charged to a stirred batchreactor in a molar ratio of 1.02:2.00 and heated with inert gas spargingto 120 to 225° C. in the presence of a small quantity of a sulfonic acidcatalyst. The acid value was monitored, and the reaction was stoppedbefore the acid value reached 0.5. Remaining trace acid was neutralizedwith 15% sodium carbonate solution. The neutralized ester was thendeodorized by steam stripping, and further purified with activatedcarbon, and then filtered. Table 1 shows the properties obtained. TABLE1 Properties of propylene glycol dibenzoate ester. Property ResultColor, APHA 10 Acid Value, mg KOH/g 0.01 Kinematic Viscosity@25° C., cSt70 Odor Faint Refractive Index@25° C. 1.545This propylene glycol dibenzoate ester was incorporated into a personalcare formulation to prepare a personal care composition.

EXAMPLE 2

Ethylene glycol and benzoic acid were charged to a stirred batch reactorin a molar ratio of 1.02:2.00 and heated with inert gas sparging to 120to 225° C. in the presence of a small quantity of catalyst, sulfonicacid catalyst. The acid value was monitored, and the reaction wasstopped before the acid value reached 0.5. Remaining trace acid wasneutralized with a 15% sodium carbonate solution. The neutralized esterwas then deodorized by steam stripping, and further purified withactivated carbon, and then filtered. Table 2 shows the propertiesobtained. TABLE 2 Properties of ethylene glycol dibenzoate ester.Property Result Color, APHA 5 Acid Value, mg KOH/g 0.01 KinematicViscosity@25° C., cSt 54 Odor Faint Refractive Index@25° C. 1.552

EXAMPLE 3

The following composition illustrates the preparation of a personal carecomposition of the invention that is a styling spray for the hair thatprovides a high degree of shine in addition to the ordinary benefitsachieved through use of a hair spray or styling spray. A styling sprayformulation was devised and a polyol polyester in accordance with theinvention was incorporated, as follows. The personal care compositionstyling spray contain the following ingredients: Formulation IngredientsParts By Weight % SD Alcohol 40-B 80.00 Neopentyl glycol diheptanoate(and) isododecane 5.00 VP/VA Copolymer (and) Water 5.00

The ingredients were combined in a vessel with gentle agitation withpropylene glycol dibenzoate (10.00 wt %) until a clear, uniform solutionis obtained. The mixture was then poured into a suitable container. Theresultant styling spray imparted a shine to the hair when applied.

EXAMPLE 4

The following composition illustrates the preparation of a personal carecomposition of the invention that is a hair relaxer emulsion that leavesthe hair shiny in addition to the ordinary benefits achieved through useof a hair relaxer. A hair relaxer formulation was devised and a polyolpolyester in accordance with the invention was incorporated as follows.A formulation was prepared (all parts given in grams): Part A: DeionizedWater 87.55 Carbomer 0.70 Propylene Glycol 1.00 Methylparaben 0.20Propylparaben 0.05 Part B: Neopentyl glycol diheptanoate (and)isododecane 3.50 Polysorbate 80 1.50 Part C: Triethanolamine 1.00 PartD: VP/VA Copolymer (and) Water 1.00

The ingredients of Part A were combined in a vessel and warmed to about70 to about 75° C. with vigorous agitation until a clear, uniformsolution is obtained. The ingredients of Part B and 3.5 grams ofpropylene glycol dibenzoate were combined in a separate vessel andwarmed to about 70 to about 75° C. until a clear solution is obtained.The solution of Part B was added to that of Part A by mixing under highshear. Mixing and heating are stopped, and Part C, triethanolamine isadded. The solution is allowed to cool to about 40 to about 45° C. PartD is added. The solution is allowed to cool to room temperature withgentle agitation. The resulting emulsion is poured into canisters. Useof the composition results in relaxed hair with shine.

EXAMPLE 5

The following composition illustrates the preparation of a personal carecomposition of the invention that is a lipstick of high gloss. Alipstick formulation was devised, and a polyol polyester in accordancewith the invention was incorporated as follows. Ingredients (given ingrams) Euphorbia cerifera (candelilla) wax 11.00 Ozokerite 3.00Microcrystalline wax 3.00 Ethylhexyl palmitate 10.00 Ricinus communis(castor) seed oil 40.40 Tocopheryl acetate 0.50 Propylparaben 0.10

The euphorbia cerifera (candelilla) wax, ozokerite, microcrystallinewax, ethylhexyl palmitate, Ricinus communis (castor) seed oil,tocopheryl acetate, and propylparaben, were combined with 20.00 grams ofpropylene glycol dibenzoate in a vessel and warmed to about 80 to about85° C. with gentle agitation until a clear, uniform solution isobtained. Mica (and) titanium dioxide (4 grams) and mica (and) ironoxides (8 grams) were individually added to this mixture under moderateagitation until a uniform solution is obtained. The heating was stoppedand the solution was permitted to cool to about 65 to about 70° C. undergentle agitation. The resulting mixture was poured into a lipstick moldheated to 45° C. and allowed to cool to room temperature.

EXAMPLE 6

The following composition illustrates the preparation of a personal carecomposition of the invention that is a hair styling wax that provides ahigh degree of shine in addition to the ordinary benefits achievedthrough use of a hair wax. A hair styling wax formulation was devisedand a polyol polyester in accordance with the invention wasincorporated, as follows. Ingredients (amounts given in weight percent)Neopentyl glycol diheptanoate (and) isododecane 73.50 Ozokerite 11.00Laureth-7 5.50

The neopentyl glycol diheptanoate (and) isododecane, laureth-7, andozokerite were combined with propylene glycol dibenzoate (10.00 wt %) ina vessel and warmed to about 80 to about 85° C. with gentle agitationuntil a clear, uniform solution was obtained. The heating was stoppedand the solution was allowed to cool to about 60 to about 65° C. undergentle agitation. The mixture was then poured into a suitable containerand allowed to cool to room temperature.

EXAMPLE 7

The following composition illustrates the preparation of a personal carecomposition of the invention that is an antiperspirant stick that leavesa minimal white residue when applied, in addition to the ordinarybenefits achieved through use of an antiperspirant stick. Anantiperspirant stick formulation was devised and a polyol polyester inaccordance with the invention was incorporated, as follows. Ingredients(amounts are given in weight Percent) Hydroxystearic acid 10.00Neopentyl glycol diheptanoate (and) isododecane 46.00 Propylene glycoldibenzoate 10.00 Talc 6.00 Aluminum zirconium tetrachlorohydrex/glycine24.00 Amorphous fumed silica 4.00

Hydroxystearic acid, neopentyl glycol diheptanoate (and) isododecane, inthe amounts given above, were combined with propylene glycol dibenzoate(10.00) in a vessel and warmed to about 80° C. to about 85° C. withgentle agitation until a clear solution is obtained. Subsequently, themixture was allowed to cool to about 70° C. The talc, aluminum zirconiumtetrachlorohydrex/glycine and amorphous fumed silica were then added tothe mixture. The mixture was agitated until uniform, then cooled toabout 70° C. to about 72° C. The resulting mixture was poured intocanisters at about 70° to about 72° C. and allowed to cool to roomtemperature.

EXAMPLE 8

This formulation illustrates the use of the invention that results in aclear antiperspirant gel that contains no water. Ingredients (amountsgiven in grams) Cetyl polyethylene glycol/polypropylene glycol-10/1dimethicone 3.00 Neopentyl glycol diheptanoate (and) isododecane 11.50Aluminum zirconium tetrachlorohydrex/glycine/propylene 80.00 glycol (30%active ingredient)

In a vessel equipped with propeller agitation, cetyl polyethyleneglycol/polypropylene glycol-10/1 dimethicone and neopentyl glycoldiheptanoate (and) isododecane were combined at a temperature of about20° C. to about 25° C. The aluminum zirconiumtetrachlorohydrex/glycine/propylene glycol (30% active ingredient) wasthen added slowly and carefully over a period of from about 15 to about25 minutes. With vigorous propeller agitation, propylene glycoldibenzoate (5.50 grams) was then added until the emulsion exhibits thedesired degree of clarity. The emulsion was then poured off to suitablecontainers.

1. A method of preparing a personal care composition, the methodcomprising: (a) reacting an aliphatic polyol having two to three carbonsatoms, which does not contain an ether group, and benzoic acid, toobtain a polyol polyester having a refractive index at 25° C. of greaterthan about 1.5; and (b) incorporating the polyol polyester into apersonal care formulation.
 2. The method of claim 1, wherein the polyolpolyester has a viscosity of about 50 to about 70 centistokes.
 3. Themethod of claim 1, wherein the aliphatic polyol is selected from thegroup consisting of propylene glycol, ethylene glycol, and1,3-propanediol.
 4. The method of claim 1, wherein the refractive indexof the polyol polyester is about 1.54 to about 1.60 at 25° C.
 5. Themethod of claim 1, wherein the personal care formulation comprises oneor more of a material selected from the group consisting of water, apigment, an emollient, a therapeutic active ingredient, an aliphaticester, an emulsifier, and a polymer.
 6. A method of preparing a personalcare composition comprising incorporating a polyol polyester into apersonal care formulation, wherein the polyol polyester is representedby the formula (I):

wherein R is an aliphatic alkyl group that does not contain an ethergroup and has a refractive index of greater than about 1.5 at 25° C. 7.The method of claim 6, wherein the personal care formulation comprisesone or more of a material selected from the group consisting of water, apigment, an emollient, a therapeutic active ingredient, an aliphaticester, an emulsifier, and a polymer.
 8. The method of claim 6, whereinthe wherein the polyol polyester has a viscosity of about 50 to about 70centistokes.
 9. The method of claim 6, wherein the wherein therefractive index of the polyol polyester is about 1.54 to about 1.60 at25° C.
 10. A polyol polyester for use in a personal care productrepresented by the formula (I):

wherein R is an aliphatic alkyl group that does not contain an ethergroup, and the polyol polyester has a refractive index of greater than1.5 at 25° C.
 11. The polyol polyester of claim 10, wherein R is analiphatic alkyl group of two to three carbon atoms.
 12. The polyolpolyester of claim 10, wherein the polyol polyester is 1,2-ethanediol.13. The polyol polyester of claim 10, wherein the polyol polyester is1,2-propanediol.
 14. The polyol polyester of claim 10, wherein thepolyol polyester is 1,3-propanediol.
 15. A personal care compositioncomprising a polyol polyester represented by the formula (I):

wherein R is an aliphatic alkyl group that does not contain an ethergroup.
 16. The personal care composition of claim 15, wherein R is analiphatic alkyl group of two to three carbon atoms.
 17. The personalcare composition of claim 15, wherein the polyol polyester is1,2-ethanediol.
 18. The personal care composition of claim 15, whereinthe polyol polyester is 1,2-propanediol.
 19. The personal carecomposition of claim 15, wherein the polyol polyester is1,3-propanediol.
 20. The personal care composition of claim 15, whereinthe composition is an aqueous composition.
 21. The personal carecomposition, of claim 15, wherein the composition is a non-aqueouscomposition.
 22. A method of increasing the refractive index of apersonal care composition comprising incorporating into the compositionan amount of a polyol polyester represented by the formula (I):

wherein R is an aliphatic alkyl group that does not contain an ethergroup and the refractive index of the polyol polyester is greater than1.5.
 23. The method of claim 22, wherein R is an aliphatic alkyl groupof two to three carbon atoms.
 24. The method of claim 22, wherein thepolyol polyester is wherein the polyol is 1,2-ethanediol.
 25. The methodof claim 22, wherein the polyol polyester is wherein the polyol is1,2-propanediol.
 26. The method of claim 22, wherein the polyolpolyester is wherein the polyol is 1,3-propanediol.
 27. A method ofpreparing a composition comprising mixing a first phase with a secondphase, wherein the second phase comprises a polyol polyester representedby the formula (I):

wherein R is an aliphatic alkyl group that does not contain an ethergroup, wherein the difference between the refractive index of the firstphase and that of the second phase is less than about 0.5.
 28. Themethod of claim 27, wherein difference between the refractive index ofthe first phase and the refractive index of the second phase is about 0.29. The method of claim 27, wherein the first phase comprises anantiperspirant active ingredient.
 30. A method of preparing acomposition having a refractive index of greater than about 1.4 at 25°C. comprising mixing at least one aliphatic ester with a polyolpolyester represented by the formula (I):

wherein R is an aliphatic alkyl group that does not contain an ethergroup, and the composition has a refractive index of greater than about1.5.
 31. A method of adjusting the phase of a personal care compositionthat comprises a first phase having a refractive index of less than orequal to about 1.5 and a second phase that has a refractive index thatis lower than that of the first phase, the method comprisingincorporating an amount of a polyol polyester into the second phase suchthat the difference between the refractive indices of the at least twophases is reduced.
 32. The method of claim 31, wherein the differencebetween the refractive indices of the at least two phases is about 0.2to about 0.5.